Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fc16a4d5df40b1…

MALICIOUS

PDF

80.6 KB Created: 2020-12-17 00:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 871985abc3f88bce497780abee16190c SHA-1: 6f242848fced6c404912f85d6cc5954c84dee850 SHA-256: 25fc16a4d5df40b1bd4f494c3051a4b0fa4d88bb0b4dda8e85004b21f5b255a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, identified as a link farm, with one prominent URL pointing to a site related to contact form CSS. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafftec.ru/aws?utm_term=contact+form+7+submit+button+hover+css PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459467/normal_5fada7e3d13c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403689/normal_5fc577681c261.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/miviliwipeziludeb.pdfIn PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/ff99ac73571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f9cbf8b4d0b3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixatax/31358288837.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/vcredist_2010_sp1_x64.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/best_android_tablet_2018_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/vizebanala.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/nusokalifemekaja.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/bofula.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/cartoon_boy_3d_model_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/88466501301.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/icmai_student_suggested_answer.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 5272 bytes
SHA-256: dfe43f1f3d60640383b2bb7095746639e75ceab8b7ef9181e61d8aab56195a15
font_01_sfnt_off0000ef4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 2052 bytes
SHA-256: f71a47484c95d7a8a65244bd51e38c405cd89f9b07b6a5ad15c9a573391ef875
font_02_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 11228 bytes
SHA-256: 4012fbeb2ec2a74609cb93a4b892375c0c86bdbd9ca3697c3cea81840bae0eb4
font_03_sfnt_off00011e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9B 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36

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